The cutting processing technique of different sectional spare parts

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As the development of science and technology and production, mechanical design and the other that special purpose has in making sectional spare parts is increasing, wait like much arris axis, camshaft, polygonal axis, crankshaft, the performance that requires to reach these spare parts place asks, its treatment precision and exterior quality demand are higher and higher also. The article machines the analytic proceed with of method and characteristic from different sectional spare parts, the accurate turning of key introduction different sectional spare parts and arenaceous belt grinding processing technique. The machines methodological different sectional spare parts treatment of 1 different sectional spare parts has 3 kinds of ways normally: Law of ① direct figuration, wait like casting, forge, punch; ② cutting motion synthesizes a law, like car, mill, dig, grind etc; ③ non-traditional machining law, the cut that be like a line, electric spark, laser beam machining. Among them, direct figuration law is the main figuration method of different sectional spare parts, but because its make precision inferior, exterior surface roughness is worth bigger, the finish machining that cannot satisfy different sectional spare parts asks. Non-traditional machining law because efficiency low, cost is high and cannot machine axial to sectional appearance is not round sectional spare parts complexly and make its application is restricted certainly. Accordingly, treatment of cutting of athletic synthesis law is the main route that acquires high accuracy different sectional part. Car, mill, dig, grind etc is the commonnest motion synthetic cutting machines a method, all can machine a different complex form spare parts. In these methods, milling and dig are cut still obtain very tall treatment precision hard at present. Grinding is commonly used accurate treatment method, and have taller manufacturing efficiency, but the horn before because emery wheel grinds bead to lose,common grinding is machined the small, Yi Dun that wear bead changes ply of bigger, cutting, cut bits easy jam temperature of emery wheel, grinding muscularity of tall, grinding, be competent hard the reason such as the workpiece with grinding curvature big change, its application is restricted certainly. Accurate turning is the accurate processing technique with rapidder in recent years development, accuse the wide application of machine tool and diamond cutting tool as number especially, make the treatment precision of accurate turning and treatment efficiency rise greatly. The turning treatment method of the turning treatment different of sectional spare parts sectional spare parts basically has 2 abnormity: Law of ① mechanical movement synthesis, the synthesis of much direction motion that passes an orgnaization namely produces different sectional turning athletic contrail; Law of ② profiling copying, use profiling to control the opposite motion contrail of lathe tool and workpiece namely, form place to want workpiece form; Law of ③ CNC Turning, use order injunction to undertake controlling to the machine tool on numerical control lathe namely, make the machine tool completes treatment process of the regulation automatically. Among them, efficiency of production of CNC Turning law and treatment precision are tall, quality is stable, size range of pipe bent is wide, can use at the automatic turning of all sorts of different sectional spare parts. When treatment object changes, need to adjust numerical control program only, can finish treatment to work, suit the automation production of much breed small lot particularly. The working angle of the cutting tool when because cutting machines different sectional spare parts,the cutting tool angle that turning of 3 different sectional spare parts machines is analysed is change, the likelihood when turning appears the larger part before losing or the horn after losing. Should appear when the horn after losing, lathe tool and workpiece surface are serious extruding, attrition, make workpiece surface quality becomes poor, excise workpiece material hard even. The horn after be being lost because of when this machines different sectional spare parts, must preventing appear, make sure lathe tool has normal working point of view. When turning different sectional spare parts, the working angle of cutting tool is concerned with feed motion and installation position not only, still concern with the sectional appearance of workpiece. The around horn of cutting tool changes those who follow workpiece appearance and change. The change of angle of job of exemple analysis cutting tool is with machining camshaft below. (A) (b) (c) pursues the change of angle of the cutting tool when 1 turning camshaft is like graph 1a place to show, when part of cutting camshaft cylinder, take no account of feed motion and the influence that point of a knife installs on any account, of cutting tool before the tagging that the horn after horn is mixed is equal to cutting tool angle; When cutting camshaft rises Cheng share, as a result of the relation of workpiece appearance, the horn before the job of cutting tool is reduced, the horn after the job increases, if pursue,1b place is shown. Namely the metabolic value of Goe=go-haoe=ao+h angle is H, the size of H horn depends on workpiece is sectional appearance. By maths the relation is known, the tangent that M nods arbitrarily on the curve and this bits of included angle of vector radius are Y, h is the complement of Y, reason has Tgh=tg(P -y)=ctgy 2 to so Tgh= Dr Rdq returns when cutting camshaft when the part, the horn before the job increases, the horn after the job is reduced, namely Goe=go+haoe=ao-h is become when H>a, the horn after the job of cutting tool is negative worth, and lathe tool of the horn after losing will be serious surface of workpiece of extruding, attrition, cannot excise workpiece material even. To make sure angle of the job when cutting tool cutting is changeless, the position that cutting tool should rotate along with workpiece swings, if pursue,2 are shown. Graph the cutting tool when 2 turning camshaft swings the grinding of spare parts of 4 abnormity curved surface machines sketch map in the grinding of different sectional spare parts in, arenaceous belt the treatment method that grinding is a kind of efficient, high accuracy, especially more ideal to the treatment effect of spare parts of different curved surface. Spare parts of different curved surface is general grinding difficulty is greater, and the treatment characteristic that the plasticity of arenaceous belt can get used to this kind of spare parts fitly. Arenaceous belt the contact of grinding annulus, pressure grind board (piece) the curved surface appearance that all can press a spare parts with osculatory line belt is changed at will, make its are in grinding process can well with curved surface be identical, it is better to obtain shape the effect. Arenaceous belt grinding still has treatment temperature low, surface roughness is worth low characteristic, can make be obtained by treatment spare parts good exterior quality, overcome the avoids very hard grinding burn appearance in grinding of emery wheel curved surface. In addition, because arenaceous belt makes technology and arenaceous tape of quality rise ceaselessly, arenaceous belt grinding already reached the level that exceeded other to machine a method even in treatment of spare parts of high accuracy curved surface, already can grind at present make lamina of gear of cycloidal gear, involute of Luo Ci annulus, big modulus, turbine wait. To the treatment of spare parts of general precision curved surface, arenaceous belt the application of grinding is more general. At present arenaceous belt a kind of when grinding already made part of different curved surface efficient nicety machines a method. CNC Milling CNC Machining